Testing 2.7a from yesterday and so far OK.

However I detect difference in stale shares reporting. The miner reports 0 stale shares in one hour, but pool shows 4 stale shares - mining on ethermine.
Also effective hashrate reported in command line does not match with web reported hashrate on Ethermine.

Bug with DevFee and reseting cards voltages is fixed.
Hashrate is compared to claymore for about 1-2% better.